There are tons of marketing automation software out in the market such as hubspot, drip, moosend, springsharp). Instead of building one from scratch what is the fastest way to integrate with these systems with the least amount of development effort.
These companies all have API's but that means I need to build the UI from scratch. I would like to be able to use these companies front end and back end which integrates with my CRM?
Does anyone have some recommendations for implementation and also potential companies that offer this type of integration?